Add pci_find_root_bus_resource() to return root bus resource for input resource.
For sparc mem64 support, We need that host bridge window res: 1. we need direct parent for request_resource_conflict() calling in pci_register_legacy_regions(). 2. check if return is NULL to decide if region is valid or not. Convert old pci_find_parent_resource() to pci_find_bus_resource(), and use it in pci_find_root_bus_resource() and new pci_find_parent_resource(). Signed-off-by: Yinghai Lu <ying...@kernel.org> --- drivers/pci/pci.c | 36 +++++++++++++++++++++++++----------- include/linux/pci.h | 2 ++ 2 files changed, 27 insertions(+), 11 deletions(-) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 602eb42..db4025f 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -415,18 +415,9 @@ int pci_find_ht_capability(struct pci_dev *dev, int ht_cap) } EXPORT_SYMBOL_GPL(pci_find_ht_capability); -/** - * pci_find_parent_resource - return resource region of parent bus of given region - * @dev: PCI device structure contains resources to be searched - * @res: child resource record for which parent is sought - * - * For given resource region of given device, return the resource - * region of parent bus the given region is contained in. - */ -struct resource *pci_find_parent_resource(const struct pci_dev *dev, - struct resource *res) +static struct resource *pci_find_bus_resource(const struct pci_bus *bus, + struct resource *res) { - const struct pci_bus *bus = dev->bus; struct resource *r; int i; @@ -456,8 +447,31 @@ struct resource *pci_find_parent_resource(const struct pci_dev *dev, } return NULL; } + +/** + * pci_find_parent_resource - return resource region of parent bus of given region + * @dev: PCI device structure contains resources to be searched + * @res: child resource record for which parent is sought + * + * For given resource region of given device, return the resource + * region of parent bus the given region is contained in. + */ +struct resource *pci_find_parent_resource(const struct pci_dev *dev, + struct resource *res) +{ + return pci_find_bus_resource(dev->bus, res); +} EXPORT_SYMBOL(pci_find_parent_resource); +struct resource *pci_find_root_bus_resource(struct pci_bus *bus, + struct resource *res) +{ + while (bus->parent) + bus = bus->parent; + + return pci_find_bus_resource(bus, res); +} + /** * pci_find_pcie_root_port - return PCIe Root Port * @dev: PCI device to query diff --git a/include/linux/pci.h b/include/linux/pci.h index 27df4a6..dd603a668 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -792,6 +792,8 @@ void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region, struct resource *res); void pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res, struct pci_bus_region *region); +struct resource *pci_find_root_bus_resource(struct pci_bus *bus, + struct resource *res); void pcibios_scan_specific_bus(int busn); struct pci_bus *pci_find_bus(int domain, int busnr); void pci_bus_add_devices(const struct pci_bus *bus); -- 1.8.4.5